The Law of Ueki is a shōnen action comedy, with elements from the fiction genre. The story starts out with the Battle of the Supernatural Powers, a tournament to decide who will be the next God (Kami in Japanese version) of The Celestial World. There are 100 candidates in total, and each candidate is required to choose a junior high school student (middle school) to act as their fighter. The student is given a unique power and is told to eliminate as many enemies as possible. The winning God Candidate will become the new God of Heaven and the winning student will receive the Blank Zai (or the Talent of Blank), a talent that can be anything they choose. While this leads many students to thoughts of greed and selfishness, Kosuke Ueki decides to take it upon himself to win this tournament to keep that power away from those that would abuse such a gift. He is supported by his friends Ai Mori, Seiichiro Sano, Rinko Jerrard, Tenko, and Hideyoshi Sōya.

The Law of Ueki was Tsubasa Fukuchi's first manga series, and he started working on it in 2000. Shogakukan picked up the series and agreed to serialize it in their Weekly Shōnen Sunday magazine. Sixteen volumes of the manga were published by Shogakukan. The English version was licensed by Viz Media, who also released sixteen volumes.

The manga series was adapted into an 51 episode anime series by Studio Deen, and aired on TV Tokyo. Geneon Entertainment licensed the English version of the anime in Canada and United States while Animax licensed it in the Asia. The anime received mixed reviews from critics.